1,1′-Binaphthyl ligands with bulky 3,3′-tertiaryalkyl substituents for the asymmetric alkyne addition to aromatic aldehydes
作者:Qin Wang、Shan-Yong Chen、Xiao-Qi Yu、Lin Pu
DOI:10.1016/j.tet.2007.03.080
日期:2007.5
The BINOL ligand (R)-2 that contains bulky 3,3'-tertiaryalkyl groups shows improved catalytic properties than the previously reported 3,3'-substituted BINOL ligands in the asymmetric alkyne addition to aromatic aldehydes. It can catalyze the phenylacetylene addition to aromatic aldehydes with high enantioselectivity (86 - 94% ee) and good yields without using Ti(O(i)Pr)(4) and a Lewis base additive
BINOL 配体 (R)-2 包含庞大的 3,3'-叔烷基基团,在不对称炔烃加成到芳香醛的过程中,比之前报道的 3,3'-取代的 BINOL 配体显示出更好的催化性能。它可以在不使用 Ti(O(i)Pr)(4) 和路易斯碱添加剂的情况下,以高对映选择性 (86 - 94% ee) 和良好的收率催化苯乙炔加成到芳香醛。还研究了 (R)-2 的几种类似物在不对称炔烃加成到醛中的催化性能。.